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电炉炉底电极对耐火材料的要求

来源:本站  点击次数:次  发布时间:2017-1-25
电炉炉底电极由导电的耐火材料、阳极铜板、出线端子及风冷体系构成,并要求与炉壳绝缘。它要求耐火材料自身除具有良好的高温功能外,还要具有良好的导电功能。在导电炉底风冷式底电极体系中,作为阳极的炉底导电耐火材料有必要具有如下特征:

Furnace bottom electrode made of conductive refractory material, copper, anode terminals and air cooling system, and insulation and the furnace shell. It requires that the refractory material has good function of high temperature as well as good conductivity. The conductive bottom air cooled bottom electrode system, as the bottom conductive refractory anode is necessary to have the following characteristics:

(1)电阻尽可能低,并且要均匀、安稳。这既要求导电耐火材料要有良好的导电性,不然电阻过大,致使电耗添加、炉底温度增加与寿数下降。为此,要求电阻率应在10-4~10-3Q·m之间;一起要求导电耐火材料的电阻率均匀,且不随温度变化或变化很小。
(1) the resistance is as low as possible, and should be even and stable. This requires a conductive refractory material has good conductivity, or resistance is too large, resulting in power consumption, increase the life and add bottom temperature drop. For this reason, it is required that the resistivity should be between 10-4 ~ 10-3Q ~ m, and the conductivity of the material is uniform, and the temperature of the material is not very small.
(2)热导率低。以确保热丢失少,提高电炉的热效率。
(2) low thermal conductivity. To ensure less heat loss and improve the thermal efficiency of electric furnace.
(3)抗热化学和热物理蚀损系数高。即要求具有良好的抗渣、抗脱落、抗氧化性及较高的耐压强度,然后取得低消耗与高寿数。
(3) high resistance to chemical and thermal erosion. The compressive strength has good slag resistance, spalling resistance, oxidation resistance and high, low consumption and high number and then get.
满足上述要求对直流电炉正常运转有着主要的含义。首要,炉子在开始送电操作时,炉底电极电阻低、导电性良好,用不着任何预热,也不必发动电极就可以发动。其次,安稳和均匀的导电功能避免电流密度过大,使底衬过热,出现热点而过早损坏。
To meet the above requirements, the direct operation of the DC furnace has the main meaning. First, the electricity at the beginning of the operation, the bottom electrode of low resistance, good electrical conductivity, without any preheating, nor will launch electrode can launch. Secondly, stable and uniform conductive function to avoid the current density is too large, so that the bottom of the hot, hot spots and premature damage.
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